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Multiple-scattering analysis of triply differential cross sections for electron emission in energetic ion-atom collisions

Guly$'a$s, L.*; Fainstein, P. D.*; Shirai, Toshizo

The role of multiple scattering events has been investigated in single ionisation of atoms induced by energetic ion impact. The triply differential cross sections has been evaluated as a function of projectile scattering angle for fixed values of the emitted electron energy and angle within the frame of the Distorted Wave Born approximation (DWB). It has been shown that the double scattering mechanism, which (sometimes) results in a characteristic double scattering peak at definite projectile scattering angle, provides a satisfactory description of the process in a wide region of electron ejection energies and angles. For low energy electron emission the role of higher orders is not negligible, and the quantum mechanical nature of the process is more emphasized. At an electron velocity equal to the projectile velocity the analogy to the mechanism of electron capture into bound states has also been investigated. In this region the DWB theory for ionisation corresponds to the Oppenheimer-Brinkman-Kramers (OBK) model for electron capture.

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